Palladium-catalyzed β-C(sp<sup>3</sup>)–H arylation of phthaloyl alanine with hindered aryl iodides: synthesis of complex β-aryl α-amino acids
作者:Xuekai Zhang、Gang He、Gong Chen
DOI:10.1039/c5ob02580j
日期:——
ethylamine (PE) auxiliary was developed. The PE auxiliary is uniquely effective at facilitating the arylation of primary C(sp3)–H bonds with sterically hindered aryl iodides. A variety of aryl iodides bearing alkoxyl, carbonyl, nitro and halogen groups on the ortho position can react with the PE-coupled phthaloyl alanine substrate in moderate to excellent yield. These reactions offer a useful solution
The regioselective carbonylation of unactivatedC(sp3)–Hbonds of aliphatic amides, using 2-pyridinylmethylamine as a directing group in conjunction with Ru3(CO)12 as a catalyst is described. The presence of a 2-pyridinylmethylamine moiety in the amides is crucial for the success of the reaction. Although ethylene is not incorporated into the products, its presence is also essential for the reaction